I would never drive someone else's car if I wasn't shown on that person's driver list (unless it was insured for any driver) unless that owner accepted that I would not pay for any damage to his car, as my insurance would not pay for that car's damage (only third-party liability).
It's a good thing I am not in a position to drive my own car in the USA as I would not, it seems from what I have read in this thread, want to drive in those states where not even third-party liability insurance is mandatory. Any joy rider could crash into me and not have to pay and not be liable for an offence. The damage would be paid out of my insurance and my premium loaded accordingly. In practice much the same happens in the UK, but at least the perpretator is committing an offence by driving uninsured. (May be committing another one by driving a stolen car, of course.)
Just in case not clear, I as driver am insured to drive other cars on third-party liability only. Additional cover is car-specific.
You CANNOT lend the car to someone else with the same level of cover unless you are paying to permit any driver. To mitigate premiums insurers allow linited lists of drivers.
I have never inquired what it would cost to insure myself to drive ANY car. It's obviously done by businesses such as garages, hotels, car park operators etc.
Clearly fully comprehensive cover costs are a function of car type/cost and drivers, as all of these contribute to the risk.
The fact that drivers with insured cars have NO cover for other vehicles may be a drag, but doesn't seem to me to be a big deal as it's just another way of allocating insurance costs. I doubt many people are seriously affected by this.
In general I agree with your comments about uninsured motorists. After all, the legitimately insured motorists pay for the reserve fund. I have seen the estimated UK figures; can't recall the amounts exactly, but it's several percent (5%?) of the premium.
I think you have two issues:
- Compulsory insurance. Personally I strongly support compulsion for basic cover.
- Reluctance to pay out. I am sympathetic to this, as insurance companies tend to try to hang on to their money. It must be said, tough, that there are quite a few fraudulent and/or inflated claims also. In the UK the market has come to be dominated by one company which has grown by acquisition, but they seem to be quite good at paying out.
DAS